/**
 * Copyright (c) 2006 George Malamidis, nutrun.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the "Software"), to deal in the Software
 * without restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies
 * or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * $Author$
 * $Rev$
 */

package aerie.response;

import aerie.context.AerieContext;
import aerie.fs.FSNeedle;
import aerie.servlet.RequestBinding;
import groovy.text.SimpleTemplateEngine;
import groovy.util.ResourceException;

import java.io.*;
import java.util.Map;

public class RenderResponder implements Responder {


    private String destination;
    private FSNeedle applicationResources;

    public final Writer writer;
    public final AerieContext context;
    public final String decorator;
    public final Map attributes;

    public RenderResponder(String destination, Writer writer, String decorator, Map attributes, RequestBinding requestBinding)
            throws ResourceException {
        this.destination = destination;
        this.writer = writer;
        this.decorator = decorator;
        this.attributes = attributes;
        if (requestBinding != null) {
            this.context = requestBinding.getAerieContext();
            this.applicationResources = requestBinding.getApplicationResources();
        } else {
            this.context = null;
            this.applicationResources = null;
        }
    }

    public void respond() throws ResourceException {
        try {

            File pageFile = new File(applicationResources.getResource("pages"), destination);

            if (!pageFile.exists()) {
                throw new ResourceException("Page [" + destination + "] not found");
            }

            String page = decorate(getText(pageFile));

            SimpleTemplateEngine engine = new SimpleTemplateEngine();

            writer.write(engine.createTemplate(page).make(attributes).toString());

        } catch (IOException e) {
            throw new ResourceException(e.getMessage(), e);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }

    public String getDestination() {
        return destination;
    }

    String decorate(String page) throws ResourceException {
        try {
            if (!hasDecorator()) return page;

            File decoratorFile = new File(applicationResources.getResource("decorators"), decorator);

            if (!decoratorFile.exists()) {
                throw new ResourceException("Decorator [" + decorator + "] not found");
            }

            return new Decorator(getText(decoratorFile)).decorate(page);

        } catch (IOException e) {
            throw new ResourceException(e.getMessage(), e);
        }
    }

    private static String getText(File file) throws IOException {
        FileInputStream stream = new FileInputStream(file);
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
        StringBuffer text = new StringBuffer();
        String line;
        while ((line = reader.readLine()) != null) {
            text.append(line).append("\n");
        }
        return text.toString();
    }

    private boolean hasDecorator() {
        return decorator != null;
    }
}
